Not so Tranquil
Location Name: Forecaster Observation - JFS Canyon Observation date: Sunday, February 9, 2020 - 15:30 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Tabs
Avalanche Details:
Date and Time of Avalanche:
Sunday, February 9, 2020 - 15:00
Number of avalanches:
1
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
New/old snow interface
Trigger:
skier
Trigger Modifier:
Accidentally Triggered
Start Zone Slope Angle:
38
Aspect:
West
Starting Elevation:
5100
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R2 Small
Crown Height:
Less than 1 ft
Avalanche Length (Vertical Run):
12ft.
Avalanche Width (Average width):
10ft.
Avalanche Location:
Date and Time of Avalanche:
Sunday, February 9, 2020 - 14:45
Number of avalanches:
2
Avalanche Type:
Loose Dry/ Sluff
Failure Plane/Weak Layer:
Within storm snow
More information or comments about the avalanche:
small sluffs triggered on steep, concave slope that didn't run far. Ran in new/ recent snow.
Trigger:
skier
Trigger Modifier:
Intentionally Triggered
Start Zone Slope Angle:
38
Aspect:
West
Starting Elevation:
5650
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Crown Height:
Less than 1 ft
Avalanche Length (Vertical Run):
25ft.
Avalanche Location:
Triggered a small soft slab while dripping down a short, steep, concave slope. Maybe 2x ski length wide; debris stopped almost immediately. Snow thickened and stiffened by cross winds. Failed on or just above 2/1 crust.